package com.ys.util.dhecp;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;
import com.ys.config.MyConfig;
import com.ys.util.DateUtil;
import com.ys.util.dhecp.exception.FileNameLengthLimitExceededException;
import com.ys.util.dhecp.exception.FileSizeLimitExceededException;
import com.ys.util.dhecp.exception.InvalidExtensionException;

import javax.imageio.ImageIO;

/**
 * 文件上传工具类
 * 
 * @author ruoyi
 */
public class FileUploadUtils
{
	
	public static final String uploadType = "local";
	
	/**
	 * 默认大小 50M
	 */
	public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

	/**
	 * 默认的文件名最大长度 100
	 */
	public static final int DEFAULT_FILE_NAME_LENGTH = 100;

	/**
	 * 默认上传的地址
	 */
	private static String defaultBaseDir = MyConfig.getProfile();

	private static int counter = 0;

	public static void setDefaultBaseDir(String defaultBaseDir)
	{
		FileUploadUtils.defaultBaseDir = defaultBaseDir;
	}

	public static String getDefaultBaseDir()
	{
		return defaultBaseDir;
	}

	/**
	 * 以默认配置进行图片上传
	 *
	 * @param file 上传的图片
	 * @return 文件名称
	 * @throws Exception
	 */
	public static final String uploadImage(MultipartFile file) throws IOException
	{
		try
		{
			return upload(getDefaultBaseDir(), file, MimeTypeUtils.IMAGE_EXTENSION);
		}
		catch (Exception e)
		{
			throw new IOException(e.getMessage(), e);
		}
	}

	/**
	 * 根据图片路径上传
	 *
	 * @param baseDir 相对应用的基目录
	 * @param file 上传的图片
	 * @return 文件名称
	 * @throws IOException
	 */
	public static final String uploadImage(String baseDir, MultipartFile file) throws IOException
	{
		try
		{
			return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
		}
		catch (Exception e)
		{
			throw new IOException(e.getMessage(), e);
		}
	}

	/**
	 * 以默认配置进行文件上传
	 *
	 * @param file 上传的文件
	 * @return 文件名称
	 * @throws Exception
	 */
	public static final String upload(MultipartFile file) throws IOException
	{
		try
		{
			return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
		}
		catch (Exception e)
		{
			throw new IOException(e.getMessage(), e);
		}
	}

	/**
	 * 根据文件路径上传
	 *
	 * @param baseDir 相对应用的基目录
	 * @param file 上传的文件
	 * @return 文件名称
	 * @throws IOException
	 */
	public static final String upload(String baseDir, MultipartFile file) throws IOException
	{
		try
		{
			return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
		}
		catch (Exception e)
		{
			throw new IOException(e.getMessage(), e);
		}
	}

	/**
	 * 文件上传
	 *
	 * @param baseDir 相对应用的基目录
	 * @param file 上传的文件
	 * @param extension 上传文件类型
	 * @return 返回上传成功的文件名
	 * @throws FileSizeLimitExceededException 如果超出最大大小
	 * @throws FileNameLengthLimitExceededException 文件名太长
	 * @throws IOException 比如读写文件出错时
	 * @throws InvalidExtensionException 文件校验异常
	 */
	public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
			throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
			InvalidExtensionException
	{
		int fileNamelength = file.getOriginalFilename().length();
		if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH)
		{
			throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
		}

		assertAllowed(file, allowedExtension);

		String fileName = extractFilename(file);

		File desc = getAbsoluteFile(baseDir, fileName);
		file.transferTo(desc);
		String pathFileName = getPathFileName(baseDir, fileName);
		return pathFileName;
	}

	/**
	 * 编码文件名
	 */
	public static final String extractFilename(MultipartFile file)
	{
		String fileName = file.getOriginalFilename();
		String extension = getExtension(file);
		fileName = DateUtil.getYYMMDD(new Date()) + "/" + encodingFilename(fileName) + "." + extension; //DateUtils.datePath()
		return fileName;
	}

	public static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException
	{
		File desc = new File(uploadDir + File.separator + fileName);

		if (!desc.getParentFile().exists())
		{
			desc.getParentFile().mkdirs();
		}
		if (!desc.exists())
		{
			desc.createNewFile();
		}
		return desc;
	}

	public static final String getPathFileName(String uploadDir, String fileName) throws IOException
	{
		int dirLastIndex = uploadDir.lastIndexOf("/") + 1;
		String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
		String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
		return pathFileName;
	}

	/**
	 * 编码文件名
	 */
	private static final String encodingFilename(String fileName)
	{
		fileName = fileName.replace("_", " ");
		fileName = Md5Utils.hash(fileName + System.nanoTime() + counter++);
		return fileName;
	}

	/**
	 * 文件大小校验
	 *
	 * @param file 上传的文件
	 * @return
	 * @throws FileSizeLimitExceededException 如果超出最大大小
	 * @throws InvalidExtensionException
	 */
	public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
			throws FileSizeLimitExceededException, InvalidExtensionException
	{
		long size = file.getSize();
		if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE)
		{
			throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
		}

		String fileName = file.getOriginalFilename();
		String extension = getExtension(file);
		if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension))
		{
			if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION)
			{
				throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
						fileName);
			}
			else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION)
			{
				throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
						fileName);
			}
			else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION)
			{
				throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
						fileName);
			}
			else
			{
				throw new InvalidExtensionException(allowedExtension, extension, fileName);
			}
		}

	}

	/**
	 * 判断MIME类型是否是允许的MIME类型
	 *
	 * @param extension
	 * @param allowedExtension
	 * @return
	 */
	public static final boolean isAllowedExtension(String extension, String[] allowedExtension)
	{
		for (String str : allowedExtension)
		{
			if (str.equalsIgnoreCase(extension))
			{
				return true;
			}
		}
		return false;
	}

	/**
	 * 获取文件名的后缀
	 * 
	 * @param file 表单文件
	 * @return 后缀名
	 */
	public static final String getExtension(MultipartFile file) {
		String extension = FilenameUtils.getExtension(file.getOriginalFilename());
		if (StringUtils.isEmpty(extension))
		{
			extension = MimeTypeUtils.getExtension(file.getContentType());
		}
		return extension;
	}


	/**
	 * 文件大小转换成MB,GB形式
	 * @param size
	 * @return
	 */
	public static Map<String, String> convertFileSize(long size) {
		long kb = 1024;
		long mb = kb * 1024;
		long gb = mb * 1024;

		Map<String, String> result = new HashMap<>();
		if (size >= gb) {
			result.put("fileSize", String.format("%.2f", (float) size / gb));
			result.put("fileSizeUnit", "GB");
		} else if (size >= mb) {
			float f = (float) size / mb;
			result.put("fileSize", String.format(f > 100 ? "%.2f" : "%.2f", f));
			result.put("fileSizeUnit", "MB");
		} else if (size >= kb) {
			float f = (float) size / kb;
			result.put("fileSize", String.format(f > 100 ? "%.2f" : "%.2f", f));
			result.put("fileSizeUnit", "KB");
		} else {
			result.put("fileSize", String.format("%d B", size));
			result.put("fileSizeUnit", "B");
		}
		return result;
	}

	/**
	 * 获取图片像素（传图片上传后路径）
	 * @param filePath 图片上传后返回的路径
	 * @return
	 */
	public static Map<String, Object> getImagePixel(String filePath) {
		BufferedImage bi = null;
		int pixelWidth = 0;
		int pixelHeight = 0;
		Map<String, Object> result = new HashMap<>();
		try {
			String fileAllPath =  MyConfig.getProfile() + filePath.replace(Constants.RESOURCE_PREFIX, "");
			bi = ImageIO.read(new File(fileAllPath));
			pixelWidth = bi.getWidth();  //像素
			pixelHeight = bi.getHeight();//像素
		} catch (Exception e) {
			e.printStackTrace();
		}
		result.put("pixelWidth", pixelWidth);
		result.put("pixelHeight", pixelHeight);
		return  result;
	}
	
	/**
	 * 获取前缀名(.号之前部分)，没有.号则取全名
	 * @param originalName 原始文件名
	 * @return
	 */
	public static String getPrefixName(String originalName) {
		int index = originalName.lastIndexOf(".");
		return index >= 0 ? originalName.substring(0, index) : originalName;
	}
	
	/**
	 * 获取后缀名(.号之后部分)，没有.号则取空字符串""
	 * @param originalName 原始文件名
	 * @return
	 */
	public static String getSuffixName(String originalName) {
		int index = originalName.lastIndexOf(".");
		return index >= 0 ? originalName.substring(index + 1, originalName.length()) : "";
	}
}